Arrangement of intercommunicating subway-loops.



E Patented Jan.3, 1911,

4g? Jr E @EZEEE llllllll 'lll e. W.';JACKSO'N. ARRANGEMENT 0F INTERUOMMUNIGATING SUBWAY LOOPS.

APPLICATION FILED MAR. 1'4, 191; RENEWED NOV. 12, 1910.

UNITED STATES PATENT OFFICE.

GEORGE W. JACKSON, OF CHICAGO, ILLINOIS.

ARRANGEMENT 0F INTERCOMIVIUNICATING- SUBWAY-LOOPS.

Specification of Letters Patent.

Patented Jan. 3, 1911.

Application filed March 14, 1910, Serial No. 549,305. Renewed November 12, 1910. Serial No. 592,081.

'1 0 all whom it may concern:

Be it known that I, GEORGE WV. JACKSON, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Arrangements of Intercommunieating Subway-Loops; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

This invention relates to a novel system or arrangement of intercolmnunicating subway loops built beneath the streets of a city for traction purposes, and. the invention relates more specifically to an arrangement of such loops designed for the congested district of a city for connecting or affording communication between points or locations where large numbers of people daily assemble or congregate so as to facilitate travel or transfer from one point to another in such district.

The purpose of the invention is to provide an intel-communicating system of sub way loops having a large capacity for conveying traffic from point to point within the district served thereby, with a moderate expense of subway construction, and arranged to avoid the handling of the crowds on the street surface.

My improved system or arrangement of subway loops is designed more specifically for connecting railway depots and hotels with each other and with the theaters and like places of amusement of a city, so arranged as to transfer passengers from station to station and to hotels, theaters and other points within the district served without depending upon the street surface transportation facilities.

The arrangement of the intercommunicating system of subway loops embodying my invention is characterized by a main loop which encompasses or surrounds the district served by the system, and a plurality of supplemental loops which traverse the territory within the main loop, and parts of which embrace portions of the main loop. That is to say, the tracks of the inner or supplemental loops are contained in part in subways that extend from one member of the main loop to another, and other parts of the tracks of the supplemental loops are contained in or run through portions of sub ways of the main loop.

The figure of the drawing illustrates an arrangement of five intercommunicating subway loops, embracing a main loop extending around or encompassing the districts served by the system and four supplemental loops intercommunioating with the main loop.

As shown in said drawing, the loop No. l, or the main loop of the subway system, beginning at the point 10, extends beneath the streets A, B, O, D, E, F, G, H, I and J, back to the point 10 on street A and com pletely surrounds the district. Loop No. 2, beginning at the point 20, embraces as three sides thereof portions of the main subway loop beneath streets A, B and C, and the remaining or fourth side is located beneath street K, the latter portion of said loop No. 2 extending across the district encompassed by the main loop No. 1. Loop N0. 3, be' ginning at the point 30, embraces as three sides thereof portions of the main subway loop beneath streets A, B and C, and the fourth side thereof is beneath the street D and extends from one side of the district to the other, the subway of said latter loop being partially occupied by loop No. 1. Loop No. 4-, beginning at the point 40, extends a distance beneath street A to street L, thence to street M, thence to street F from which point a portion of the loop parallels a portion of the loop N o. l beneath streets F, G and H to the point 41, from whence the loop No. 4 extends beneath streetI and street N to the point 40 of beginning on street A. Loop No. 5, beginning at said point 10, extends beneath street A to street L, thence to street M, thence to street F, thence to street G, thence to street H, thence to street I, thence to street J and thence to the point 10 of beginning on street A. It will be observed that the tracks of loop No. 5 occupy portions of the loops Nos. 1 and 1, it having no independent subway loop of its own. A short connecting loop No. 6 connects loop No. 3 with loops No. A and No. 5 in street M, whereby cars may pass from loop No. 3 to either of loops No. 4 and No. 5.

The several loops are designated by dlIIGI'. entiating marks to facilitate the tracing of the same through the several subways. While the loops occupying the same subways are indicated as'arranged side by side, it will be understood that all parts of the several subway loops may be sin le tracked, and that the several cars of the difierent loops occupying a given portion of the subway may run ona single track.

In the arrangement herein shown loop N o. 1, extending around or encompassing the district served by the system, affords direct communication between the points a, b, 0, (Z, c which may be railway depots located around the district, thereby affording means for transferring passengers from one depot to the other without the necessity of passing through the crowded portions of the district at the street level. Loops Nos. 2, 8, 4 and 5 each communicate with one or more of the designated depots and traverse the district to afford communication between the hotels, theaters and other public buildings in the central part of the district, as indicated by the shaded outlines, and between the depots and said central locations. Certain of said supplemental loops, notably loops Nos. 3 and 5, afford communication between outlying points, as the railway depots, as for instance, between the depots designated by a, e and d.

At the intersections of loops provision will be made for transferring from one loop to another so that a passenger may transfer from the main loop to any of the supplemental loops, or may transfer from any supplemental loop, through the main loop, to any other supplemental loop. Access to the subway loops and egress therefrom will be had through suitable shafts located at the depots and other suitable points along the lines of the loops and at the intersections of I loops.

The arrangement shown provides for a most convenient and accessible transfer of passenger traffic from one part of a crowded city district to another with the use of a moderate mileage of. subway to accommodate the same, and with a correspondingly low cost of maintenance of tracks and subway appliances. Said arrangement takes a large part of the morning and evening crowd off the streets and also provides for conveniently and comfortably handling the crowds that enter the crowded part of the city during the evening for entertainment at theaters and like places.

I claim as my invention:

1. An arrangement of intercommunicating subway loops constructed beneath the streets of the district served thereby, comprising a main loop surrounding said district and a plurality of supplemental loops, portions of which are contained in the subway of the main loop and other portions of which traverse or extend across said district, whereby passengers may transfer from one loop to any of the others.

2. The arrangement of intercommunicating subway loops described, comprising the main loop No. 1 surrounding the district served and the supplemental loops No. 2, No. 3, No. 4 and No. 5, each arranged partially within the subway of loop No. 1 and with other parts extending across said district.

3. The arrangement of interconnnunicating subway loops described, comprising the main loop No. 1 surrounding the district served and the supplemental loops No. 2, No. 3, No. 4 and N0. 5, each arranged partially within the subway of loop No. 1 and with other parts extending across said district, and the short subway No. 6 connecting two adjacent subways.

In testimony that I claim the foregoing as my invention I afiix my signature in the presence of two witnesses, this 28th day of F ebruary A. D. 1910.

GEORGE W. JACKSON.

\Vitnesses F. A. GETTLESON, K. CLUx'roN. 

